Fireproof equipment cable
By using a combination design of high-temperature resistant insulating paint, ceramic fiber tape and water-based fire-resistant coating in the refractory cable, the problems of low production efficiency and unstable fire resistance performance are solved, and efficient and environmentally friendly fire-resistant cable production is achieved, with excellent thermal insulation and fire-proof functions and material recycling capabilities.
Patent Information
- Application Number
- CN202421904630.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The production efficiency of existing fire-resistant cables is low, affecting employee health, unstable fire-resistant performance, and conventional mica belt wraps have quality problems.
High-temperature resistant insulating paint is used to form a refractory layer, combined with the structural design of ceramic fiber belt wrapping cushion layer, modified PP belt armor layer and water-based fireproof coating fire protection layer, avoid the defects of mica belt wrapping, and improve production efficiency and fire resistance level.
It improves production efficiency, reduces production costs, ensures the stability of fire resistance and employee health, has significant thermal insulation and fireproof functions, the materials can be recycled and the current carrying capacity is increased by 7%.
Smart Images
Figure CN223140441U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cables, and particularly relates to a fire-resistant equipment cable. Background Art
[0002] With the development of society, special scenarios such as high-rise buildings, public entertainment places, and power distribution cabinets have emerged continuously. Their power consumption is increasing day by day, and the variety and quantity of equipment cables have also increased accordingly. Electric wires and cables can not only transmit and distribute electric energy and transfer information, but also be the "fuse" causing fires.
[0003] At present, the common structure of fire-resistant cables is that two layers of fire-resistant tapes such as mica or synthetic mica are wound around the conductor. Such a structure has a low production efficiency due to a high lap rate of the mica tapes. At the same time, during the production winding process, the mica layer is easily peeled off as the tape bends and winds, directly affecting the occupational health of employees and the fire-resistant performance of the product. On the other hand, fluffing and filament extraction of the mica tape cause extrusion of the insulation, resulting in quality problems such as uneven outer diameter of the insulation. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a fire-resistant equipment cable, which solves the problems of low production efficiency, affecting the occupational health of employees, and unstable fire-resistant performance of the existing fire-resistant equipment cables.
[0005] The utility model is realized through the following technical solutions:
[0006] The utility model discloses a fire-resistant equipment cable, which comprises a cable core, a wrapping cushion layer, an armor layer, a sheath layer, and a fireproof layer arranged in sequence from inside to outside; the cable core is formed by stranding a plurality of single wires, and each single wire comprises a conductor, a fire-resistant layer, and an insulating layer arranged in sequence from inside to outside;
[0007] The fire-resistant layer is formed by a high-temperature resistant insulating paint, and the high-temperature resistant insulating paint has a temperature resistance of not less than 950 °C.
[0008] Further, the thickness of the fire-resistant layer is below 0.20 mm.
[0009] Further, the thickness of the fire-resistant layer is 0.14 mm - 0.16 mm.
[0010] Further, the thickness of the insulating layer is 0.7 - 0.8 mm.
[0011] Further, the insulating layer is made of an environmentally friendly modified PP insulating material.
[0012] Further, the wrapping cushion layer is a ceramic fiber tape wrapped around the cable core.
[0013] Further, the thickness of the ceramic fiber tape is 0.25 - 0.35 mm, and the lap rate of the ceramic fiber tape wrapping is not higher than 25%.
[0014] Furthermore, the armor layer is made by winding modified PP tapes with gaps.
[0015] Furthermore, the fireproof layer is made of water-based fireproof paint.
[0016] Furthermore, the thickness of the water-based fireproof paint is 0.2 - 0.3 mm.
[0017] Compared with the prior art, the utility model has the following beneficial technical effects:
[0018] The utility model provides a fire-resistant equipment cable, which includes a conductor, a fire-resistant layer, an insulating layer, a wrapping cushion layer, an armor layer, a sheath layer and a fireproof layer arranged in sequence from inside to outside; the fire-resistant layer is formed by high-temperature resistant insulating paint, and the production efficiency of the high-temperature resistant insulating paint is 3 - 4 times that of mica tape. Moreover, the common mica tape has a fire-resistant grade of 750 °C, while the fire-resistant grade of the high-temperature resistant insulating paint of the utility model is above 950 °C, and the fire-resistant grade is superior to the existing conventional fire-resistant grade. The surface of the fire-resistant layer formed by the dried high-temperature resistant insulating paint is flat, avoiding the wrinkles at the lap joints formed by the winding of mica tape, or the fluffing on the surface after the high-speed winding of mica tape, which may cause quality problems such as uneven insulation surface, unstable outer diameter and surface bumps. The fire-resistant equipment cable of the utility model has the advantages of high production efficiency, being beneficial to occupational health, being beneficial to material recycling and more stable fire-resistant performance.
[0019] Furthermore, an environmentally friendly modified PP insulating material is extruded on the outside of the fire-resistant layer to form the insulating layer. Compared with the common cross-linked polyethylene insulation, the environmentally friendly modified PP insulating material has outstanding low-carbon environmental protection performance, can realize the recycling of materials after the cable reaches the end of its life, and the current-carrying capacity can be increased by 7% compared with the cross-linked polyethylene cable of the same specification.
[0020] Furthermore, the wrapping cushion layer is a ceramic fiber tape wrapped around the cable core formed after the insulation is stranded. Compared with the conventional fire-resistant cable with an extruded cushion layer, the wrapping cushion layer can be realized in the process of insulating stranding and cabling. The utility model selects the ceramic fiber tape cushion layer, which reduces one extrusion production process. Therefore, the utility model selects the ceramic fiber tape as the wrapping cushion layer, which can reduce the production cost.
[0021] Furthermore, the armor layer is a modified PP tape wrapped around the wrapping cushion layer. Compared with the conventional galvanized steel tape, on the one hand, it reduces the weight of the cable. Secondly, for single-core armored cables, it avoids the easy generation of eddy currents in metal pipes, does not reduce the transmission efficiency of the cable, and does not affect the normal operation of surrounding electronic devices.
[0022] Furthermore, the material of the fireproof layer is water-based fireproof paint, which can generate a uniform and dense sponge-like foam isolation layer when encountering fire, has a significant heat insulation and fireproof function, and can more effectively print and block the spread and spread of fire. Conventional fire-resistant cables do not have this function. Description of the Drawings
[0023] Figure 1 It is a schematic diagram of a cable for a refractory equipment of the present utility model;
[0024] Figure 2 It is a schematic diagram of the structure of a single wire;
[0025] Among them, 1, conductor; 2, refractory layer; 3, insulating layer; 4, wrapping cushion layer; 5, armor layer; 6, sheath layer; 7, fireproof layer; 8, single wire. Specific embodiments
[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details are provided in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments.
[0027] The components described and shown in the drawings and embodiments of the present utility model can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present utility model provided in the following drawings is not intended to limit the scope of the present utility model to be protected, but only represents a selected embodiment of the present utility model. Based on the drawings and embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present utility model.
[0028] It should be noted that: the term "comprising", "including" or any other variant is intended to cover non-exclusive inclusion, so that a process, element, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or device.
[0029] The features and performance of the present utility model are further described in detail below in conjunction with the embodiments.
[0030] As Figure 1 shown, the present utility model discloses a cable for a refractory equipment, including a cable core formed by stranding a plurality of single wires 8, and a wrapping cushion layer 4, an armor layer 5, a sheath layer 6 and a fireproof layer 7 sequentially coated on the outside of the cable core from the inside to the outside. As Figure 2 shown, each single wire 8 includes a conductor 1, a refractory layer 2 and an insulating layer 3 sequentially arranged from the inside to the outside.
[0031] The refractory layer 2 is formed by a high-temperature resistant insulating paint, and the high-temperature resistant insulating paint has a temperature resistance of not less than 950 °C.
[0032] During design, the thickness of the refractory layer 2 made of high-temperature resistant insulating paint should not be greater than 0.20 mm. The thinner the single-layer thickness of the refractory layer 2, the better. More preferably, it can be selected from 0.14 mm to 0.16 mm.
[0033] The high-temperature resistant insulating paint is a kind of paint with good insulation performance and high-temperature resistance. It can maintain electrical insulation performance in high-temperature environments and prevent problems such as current leakage and breakdown.
[0034] The insulating layer 3 is a layer of environmentally friendly modified PP insulating material, and the thickness of the insulating layer 3 is 0.7 - 0.8 mm 。
[0035] The wrapping cushion layer 4 is two layers of ceramic fiber tapes wrapped around the cable core. The thickness of the ceramic fiber tape is not less than 0.2 mm, and the wrapping overlap rate of the ceramic fiber tape is not higher than 25%.
[0036] A PP tape is double-layered and wrapped with gaps outside the wrapping cushion layer 4 to form the armor layer 5, and the wrapping overlap rate of the armor layer 5 is 55% - 60%.
[0037] Specifically, the fireproof layer 7 is a layer of water-based fireproof paint coated on the sheath layer 6, and the thickness of the water-based fireproof paint is not less than 0.2 mm.
[0038] The preparation process of the fire-resistant equipment cable of the present utility model is as follows:
[0039] A layer of high-temperature resistant insulating paint is coated on the conductor 1 to form the refractory layer 2. After drying, a layer of PP insulating material is extruded on the refractory layer 2 to form a single wire 8. Multiple single wires 8 are stranded into a cable core. Two layers of ceramic fiber tapes are wrapped around the cable core to form the wrapping cushion layer 4. A modified PP tape is double-layered and wrapped with gaps outside the wrapping cushion layer 4 to make the armor layer 5. A sheath layer 6 is extruded outside the armor layer 5, and a fireproof layer 7 is provided outside the sheath layer 6.
[0040] The production efficiency of coating high-temperature resistant insulating paint is 3 - 4 times that of mica tape. The common mica tape has a fire resistance rating of 750 °C, while the fire resistance rating of the present utility model is 950 °C, and the fire resistance rating is superior to the existing conventional fire resistance rating.
[0041] The surface of the refractory layer 2 formed by drying the high-temperature resistant insulating paint is flat, while the mica tape wrapping will form wrinkles at the lap joints. At the same time, after the mica tape is wrapped at high speed, the surface will become hairy, which is likely to cause unevenness of the insulation surface, problems such as unstable outer diameter and surface bumps. The technical solution adopted in this patent avoids the above quality problems.
[0042] An environmentally friendly modified PP insulating material is extruded outside the refractory layer 2. Compared with the common cross-linked polyethylene insulation, the environmentally friendly modified PP insulating material has outstanding low-carbon environmental protection performance, can realize material recycling after the cable life ends, and the current-carrying capacity can be increased by 7% compared with the cross-linked polyethylene cable of the same specification.
[0043] After cabling and stranding, two layers of ceramic fiber tape cushions are wrapped simultaneously. For conventional fire-resistant cables, in order to facilitate the metal tape armor, an extruded cushion is usually selected, which has one more production process than the ceramic fiber tape cushion of the present utility model and increases the corresponding production cost.
[0044] Two layers of modified PP tapes are wrapped around the outside of the cushion 4 with double-layer gaps to form an armor layer 5. Compared with conventional galvanized steel tapes, on the one hand, the weight of the cable is reduced. Secondly, for single-core armored cables, eddy currents are not easily generated in metal pipes, the transmission efficiency of the cable is not reduced, and at the same time, the normal operation of surrounding electronic devices is not affected. While controlling the cable weight, excellent mechanical strength is ensured, and the lapping rate is not easily too small.
[0045] A water-based fireproof coating is applied to the outer sheath layer 6. When encountering fire, it can generate a uniform and dense sponge-like foam isolation layer, which has a significant heat insulation and fireproof function, and can more effectively print and block the spread and spread of flames. Conventional fire-resistant cables do not have this function.
[0046] The water-based fireproof coating is a fireproof coating using water as a solvent or dispersion medium, and has the following characteristics and advantages:
[0047] Good environmental protection: non-toxic, odorless, friendly to the environment, does not contain harmful substances and volatile organic compounds (VOC), and meets environmental protection requirements.
[0048] Strong compatibility: does not chemically react with most anticorrosive primers.
[0049] No irritating odor: does not produce irritating odor during use.
[0050] Relatively low price: Compared with oil-based fireproof coatings, it has certain advantages in terms of price, and no special thinner is required during dilution.
[0051] The water-based fireproof coating can expand rapidly when encountering fire, generating a uniform and dense sponge-like foam isolation layer, thereby improving the fire resistance limit of the cable.
[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit it. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present utility model can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present utility model shall be covered by the protection scope of the claims of the present utility model.
Claims
1. A fire-resistant equipment cable, characterized in that, It includes a cable core, a wrapping cushion layer (4), an armor layer (5), a sheath layer (6) and a fireproof layer (7) which are arranged in sequence from the inside to the outside; the cable core is formed by stranding a plurality of single wires (8), and each single wire (8) includes a conductor (1), a fire-resistant layer (2) and an insulating layer (3) which are arranged in sequence from the inside to the outside; The fire-resistant layer (2) is formed by a high-temperature resistant insulating paint, and the high-temperature resistant insulating paint has a temperature resistance of not less than 950 °C.
2. A refractory equipment cable according to claim 1, characterized in that, The thickness of the fire-resistant layer (2) is below 0.20 mm.
3. A refractory equipment cable according to claim 2, characterized in that, The thickness of the fire-resistant layer (2) is 0.14 mm - 0.16 mm.
4. A refractory equipment cable according to claim 1, characterized in that, The thickness of the insulating layer (3) is 0.7 - 0.8 mm.
5. A refractory equipment cable according to claim 1, characterized in that, The insulating layer (3) is made of an environmentally friendly modified PP insulating material.
6. A refractory equipment cable according to claim 1, characterized in that, The wrapping cushion layer (4) is a ceramic fiber tape wrapped around the cable core.
7. A refractory equipment cable according to claim 6, characterized in that, The thickness of the ceramic fiber tape is 0.25 - 0.35 mm, and the wrapping overlap rate of the ceramic fiber tape is not higher than 25%.
8. A refractory equipment cable according to claim 1, characterized in that, The armor layer (5) is made by gap wrapping with a modified PP tape.
9. A refractory equipment cable according to claim 1, characterized in that, The fireproof layer (7) is made of a water-based fireproof paint.
10. A refractory equipment cable according to claim 9, characterized in that, The thickness of the water-based fireproof paint is 0.2 - 0.3 mm.